摘要
岩溶区特殊的地形地貌,使得地表环境中的有机氯农药(OCPs)很容易进入地下环境,对地下水的安全构成威胁。采用气相色谱-电子捕获检测器(GC-ECD)对湖北秭归鱼泉洞泉域系统中的典型OCPs——六六六(HCHs)和滴滴涕(DDTs)进行了检测,探究了其时空分布特征、潜在污染来源和迁移特征。结果表明:水体中HCHs质量浓度范围为0.09~5.17 ng/L,土壤和泉沉积物中HCHs质量分数范围分别为0.36~3.67,0.11~2.53 ng/g;水体中DDTs质量浓度范围为0.13~7.16 ng/L,土壤和泉沉积物中DDTs质量分数范围分别为0.22~19.13,0.73~11.53 ng/g,呈现出以DDTs为主的污染特征。水体中HCHs和DDTs质量浓度在冬季最高;土壤中HCHs和DDTs质量分数分别在夏季和冬季达到最高;泉沉积物中HCHs和DDTs质量分数分别在夏季和春季达到峰值。特征比值结果显示,水体、土壤和泉沉积物中HCHs主要源于林丹的使用;水体中DDTs主要源于历史残留,而土壤和泉沉积物中DDTs主要来源于近期使用。相关性分析结果表明,HCHs和DDTs可从补给区地表水和补给区土壤分别向排泄区泉水和泉沉积物中迁移。HCHs和DDTs在介质中的快速迁移证实了岩溶区地下水的脆弱性。本研究成果可以为岩溶地下水资源和环境的保护提供参考。
The special topography of karst areas allows organochlorine pesticides(OCPs)from the surface environment to easily infiltrate the underground environment,posing a threat to groundwater security.[Methods]In this study,a gas chromatography-electron capture detector(GC-ECD)was used to detect two typical OCPs,namely,HCHs and DDTs,in the Yuquandong spring system in Zigui,Hubei.[Objective]This study investigated spatial and temporal distribution characteristics,sources and transport of HCHs and DDTs.[Results]The results showed that the mass concentrations of HCHs in the water ranged from 0.09 to 5.17 ng/L,and the mass fractions of HCHs in the soils and spring sedimentsranged from 0.36 to 3.67,0.11 to 2.53 ng/g,respectively,mass concentrations of DDTs in the water ranged from 0.13 to 7.16 ng/L,and the mass fractions of DDTs in the soils and spring sedimentsranged from 0.22 to 19.13,0.73 to 11.53 ng/g,indicating that the pollution was dominated by DDTs.The highest mass concentrations of HCHs and DDTs in water were observed in winter;the highest mass fractions of HCHs and DDTs in the soils were observed in summer and winter,respectively;and the mass fractions of HCHs and DDTs in the spring sediments peaked in summer and spring,respectively.Characteristic ratios showed that HCHs in water,soils and spring sediments mainly originated from lindane usage,DDTs in water mainly originated from historical residues,and DDTs in the soils and spring sediments mainly originated from recent usage.Correlation analysis indicated that HCHs and DDTs could be transported from the surface water and the soils in the recharge area to the spring water and spring sediments in the discharge area,respectively.The rapid transport of HCHs and DDTs across multiple media confirmed groundwater vulnerability in karst areas.[Conclusion]The study can provide a reference for the protection of karst groundwater resources and the environment.
作者
杨秀雯
魏志莹
易佳佩
李雯星
景一鸣
秦超杰
熊俊武
刘伟
周宏
祁士华
陈伟
YANG Xiuwen;WEI Zhiying;YI Jiapei;LI Wenxing;JING Yiming;QIN Chaojie;XIONG Junwu;LIU Wei;ZHOU Hong;QI Shihua;CHEN Wei(School of Environmental Studies Key Laboratory of Yangtze Catchment Environmental Aquatic Science,China University of Geosciences(Wuhan),Wuhan 430074,China;Institute of Geological Survey,China University of Geosciences(Wuhan),Wuhan 430074,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences(Wuhan),Wuhan 430074,China;Key Laboratory of Yangtze Catchment Environmental Aquatic Science,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2024年第3期311-322,共12页
Bulletin of Geological Science and Technology
基金
国家重点研发计划“场地土壤污染成因与治理技术”重点专项项目(2019YFC1805502)
国家自然科学基金青年项目(41907327,42007178)
中国地质调查局地质调查项目(DD2019082)。
